Test will now use disk_access_ functions to erase FAT FS
disk before some operations when target disk is not set with
CONFIG_DISK_DRIVER_FLASH.
Fixes#53151
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
Add flash disk description to overlays. Specify custom flashdisk
partition for fat fs api test to match the Kconfig values, because
native posix storage partition is too small for FatFS filesystem.
Co-authored-by: Johann Fischer <johann.fischer@nordicsemi.no>
Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>